Hi!
Sorry for English language but I can't write in German (someone can translate it to your language if you want
). I am author of article at Polish Wikipedia. I write there to explain some things:
1) "Records" of athletes from Moldova, Wales, Argentina and Armenia at 100% are not true - all of them was added at English Wikipedia by Polish author who later said that he thinked up them to check reliability of Wikipedia.
2) Record of Ireland are certainly not true. Firstly no one source says length of jumps of Brown and his friend - 35 metres was only a K-Point of bigger ski jump in which they jumped. Secondly they are NOT from Ireland, they are from NORTHERN Ireland (so they are from United Kingdom) -
source.
3) Can you give me any source to record of Luxembourg? Because there is the only place where it is said, so I think that it can be thinked up like records of Moldova, Wales, Argentina and Armenia...
4) For records of smaller countries without professional athletes I just write the longest jump that can be found in sources - probably some of them are not true (for example Bosnian athletes was trained by polish ski jumping coach before Winter Olympics at Sarajevo so they probably jumped more than 36 metres but unfortunately we don't have any source for it).
5) For countries that wasn't independent during their record was set I am looking at records in other sports (like athletics) - if there records from this period was recognized (like in Croatia, Georgia, Lithuania, Latvia (you don't have other record holder of Latvian record at your list) Serbia, Macedonia and Bosnia) I do it the same with ski jumping record.
6) And last but not least - I always look at reliability of sources and don't add all "records" that can be found at the Internet. Why? Because some of them are really hard to believe - for example Faik Yuksel in 2010 in interview for Slovenian TV said that he jumped 150 metres in Oberstdorf - but when he could did it if he never jumped at ski flying hill (it is unbelievable to achieve this distance at Schattenbergschanze)?!